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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule Of Fair Value Of Financial Instruments [Abstract]  
Schedule Of Fair Value of Financial Instruments
RECURRING FAIR VALUE MEASURES ― SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
  At fair value as of December 31, 2012
         Collateral  
   Level 1 Level 2 Level 3 Netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 539$ ―$ ―$ ―$ 539
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  87  69  ―  ―  156
Municipal bonds   ―  63  ―  ―  63
Other securities   ―  130  ―  ―  130
Total debt securities  87  262  ―  ―  349
Total nuclear decommissioning trusts(1)  626  262  ―  ―  888
Interest rate instruments  ―  68  ―  ―  68
Commodity contracts subject to rate recovery  13  ―  61  ―  74
Commodity contracts not subject to rate recovery  28  15  ―  ―  43
Investments  1  ―  ―  ―  1
Total$ 668$ 345$ 61$ ―$ 1,074
Liabilities:          
Interest rate instruments$ ―$ 126$ ―$ ―$ 126
Commodity contracts subject to rate recovery  23  9  ―  (23)  9
Commodity contracts not subject to rate recovery  6  23  ―  (11)  18
Total$ 29$ 158$ ―$ (34)$ 153
            
 At fair value as of December 31, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 468$ ―$ ―$ ―$ 468
Debt securities:          
Debt securities issued by the U.S. Treasury and other           
U.S. government corporations and agencies  92  78  ―  ―  170
Municipal bonds  ―  77  ―  ―  77
Other securities  ―  78  ―  ―  78
Total debt securities  92  233  ―  ―  325
Total nuclear decommissioning trusts(1)  560  233  ―  ―  793
Interest rate instruments  ―  66  ―  ―  66
Commodity contracts subject to rate recovery  10  1  23  ―  34
Commodity contracts not subject to rate recovery  15  35  ―  (2)  48
Investments  5  ―  ―  ―  5
Total$ 590$ 335$ 23$ (2)$ 946
Liabilities:          
Interest rate instruments$ 1$ 124$ ―$ ―$ 125
Commodity contracts subject to rate recovery  61  13  ―  (61)  13
Commodity contracts not subject to rate recovery  1  52  ―  (4)  49
Total$ 63$ 189$ ―$ (65)$ 187
(1)Excludes cash balances and cash equivalents.          

FAIR VALUE OF FINANCIAL INSTRUMENTS
(Dollars in millions)
  December 31, 2012
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Investments in affordable housing partnerships(1)$ 12 $ ―$ ―$ 36$ 36
Total long-term debt(2)  11,873   ―  12,287  956  13,243
Preferred stock of subsidiaries  99   ―  107  ―  107
SDG&E:           
Total long-term debt(3)$ 4,135 $ ―$ 4,243$ 345$ 4,588
Contingently redeemable preferred stock  79   ―  85  ―  85
SoCalGas:           
Total long-term debt(4)$ 1,413 $ ―$ 1,599$ ―$ 1,599
Preferred stock  22   ―  24  ―  24
             
  December 31, 2011
  Carrying Fair Value
  Amount Level 1Level 2Level 3Total
Sempra Energy Consolidated:           
Investments in affordable housing partnerships(1)$ 21 $ ―$ ―$ 48$ 48
Total long-term debt(2)  9,826   ―  10,447  600  11,047
Preferred stock of subsidiaries  99   ―  106  ―  106
SDG&E:           
Total long-term debt(3)$ 3,895 $ ―$ 3,933$ 355$ 4,288
Contingently redeemable preferred stock  79   ―  86  ―  86
SoCalGas:           
Total long-term debt(4)$ 1,313 $ ―$ 1,506$ ―$ 1,506
Preferred stock  22   ―  23  ―  23
(1)Investments in affordable housing partnerships at Parent and Other.
(2)Before reductions for unamortized discount (net of premium) of $16 million at both December 31, 2012 and 2011, and excluding capital leases of $189 million at December 31, 2012 and $204 million at December 31, 2011, and commercial paper classified as long-term debt of $300 million at December 31, 2012 and $400 million at December 31, 2011. We discuss our long-term debt in Note 5.
(3)Before reductions for unamortized discount of $12 million at December 31, 2012 and $11 million at December 31, 2011, and excluding capital leases of $185 million at December 31, 2012 and $193 million at December 31, 2011.
(4)Before reductions for unamortized discount of $4 million at December 31, 2012 and $3 million at December 31, 2011, and excluding capital leases of $4 million at December 31, 2012 and $11 million at December 31, 2011.
Schedule Of Cash Collateral Not Offset With Derivative Instruments [Abstract]  
Schedule Of Fair Value of Cash Collateral Receivables Not Offset on the Consolidated Balance Sheets
 December 31,
(Dollars in millions)20122011
Sempra Energy Consolidated$ 35$ 20
SDG&E  13  10
SoCalGas  3  2
Schedule Of Recurring Fair Value Assets Liabilities [Abstract]  
Schedule Of Recurring Fair Value Measures
RECURRING FAIR VALUE MEASURES ― SDG&E
(Dollars in millions)
 At fair value as of December 31, 2012
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 539$ ―$ ―$ ―$ 539
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  87  69  ―  ―  156
Municipal bonds   ―  63  ―  ―  63
Other securities   ―  130  ―  ―  130
Total debt securities  87  262  ―  ―  349
Total nuclear decommissioning trusts(1)  626  262  ―  ―  888
Commodity contracts subject to rate recovery  12  ―  61  ―  73
Commodity contracts not subject to rate recovery  1  ―  ―  ―  1
Total$ 639$ 262$ 61$ ―$ 962
           
Liabilities:          
Interest rate instruments$ ―$ 81$ ―$ ―$ 81
Commodity contracts subject to rate recovery  23  8  ―  (23)  8
Total$ 23$ 89$ ―$ (23)$ 89
           
 At fair value as of December 31, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Nuclear decommissioning trusts          
Equity securities$ 468$ ―$ ―$ ―$ 468
Debt securities:          
Debt securities issued by the U.S. Treasury and other          
U.S. government corporations and agencies  92  78  ―  ―  170
Municipal bonds   ―  77  ―  ―  77
Other securities   ―  78  ―  ―  78
Total debt securities  92  233  ―  ―  325
Total nuclear decommissioning trusts(1)  560  233  ―  ―  793
Commodity contracts subject to rate recovery  9  ―  23  ―  32
Commodity contracts not subject to rate recovery  1  ―  ―  ―  1
Total$ 570$ 233$ 23$ ―$ 826
           
Liabilities:          
Interest rate instruments$ ―$ 81$ ―$ ―$ 81
Commodity contracts subject to rate recovery  61  12  ―  (61)  12
Total$ 61$ 93$ ―$ (61)$ 93
(1)Excludes cash balances and cash equivalents.          

RECURRING FAIR VALUE MEASURES ― SOCALGAS
(Dollars in millions)
 At fair value as of December 31, 2012
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 1$ ―$ ―$ ―$ 1
Commodity contracts not subject to rate recovery  3  ―  ―  ―  3
Total$ 4$ ―$ ―$ ―$ 4
           
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
           
 At fair value as of December 31, 2011
        Collateral  
  Level 1 Level 2 Level 3 netted Total
Assets:          
Commodity contracts subject to rate recovery$ 1$ 1$ ―$ ―$ 2
Commodity contracts not subject to rate recovery  2  ―  ―  ―  2
Total$ 3$ 1$ ―$ ―$ 4
           
Liabilities:          
Commodity contracts subject to rate recovery$ ―$ 1$ ―$ ―$ 1
Total$ ―$ 1$ ―$ ―$ 1
Schedule Of Recurring Fair Value Assets Liabilities Unobservable Input Reconciliation [Abstract]  
Schedule Of Recurring Fair Value Measures Level 3 Rollforward
LEVEL 3 RECONCILIATIONS
(Dollars in millions)
 Years ended December 31,
 201220112010
Balance as of January 1$ 23$ 2$ 10
Realized and unrealized gains (losses)  31  32  (16)
Allocated transmission instruments  58  7  8
Settlements  (51)  (18)  ―
Balance as of December 31$ 61$ 23$ 2
Change in unrealized gains or losses relating to       
instruments still held at December 31$ 17$ 17$ (9)
Schedule Of Non Recurring Fair Value Measures [Abstract]  
Schedule Of Non Recurring Fair Value Measures
NON-RECURRING FAIR VALUE MEASURES ― SEMPRA ENERGY CONSOLIDATED
(Dollars in millions)
    % of  
 Estimated FairFair Value  
 Fair ValueMeasure- Range of
 Value(1)Valuation TechniqueHierarchymentInputs Used to Develop MeasurementInputs
Investment in      
Rockies Express$ 369(2)Market approachLevel 267%Equity sale offer price100%
       
       
  Probability weightedLevel 333%Combined transportation rate assumption(4)6% - 78%
  discounted cash flow  Counterparty credit risk on existing contractsLow
     Operation and maintenance escalation rate0% - 1%
     Forecasted interest rate on debt to be refinanced5% - 10%
     Discount rate8% - 10%
Investment in       
RBS Sempra      
Commodities$ 126(3)Discounted cash flowLevel 3100%Future cash distributions90% - 110%
(1)At measurement date.
(2)Estimated fair value does not include $13 million of equity earnings and $21 million of dividend distributions that occurred subsequent to September 30, 2012.
(3)There have been no earnings or distributions subsequent to September 30, 2011.
(4)Transportation rate beyond existing contract terms as a percentage of current mean REX rates.